#include <stdio.h>
int units = 0;
void critic(void);

int main()
{
    extern int units;
    printf("How many pounds to a firkin of butter?\n");
    scanf("%d", &units);
    while (units != 56)
    {
        critic();
    }
    printf("You must looked it up!\n");
    return 0;
}
void critic(void)
{
    printf("No luck, my friend. Try again.\n");
    scanf("%d", &units);
}